JP5017420B2 - Session information matching processing method and call control server - Google Patents

Description

  The present invention relates to a technique for matching session information related to SIP.

  FIG. 15 is a diagram schematically showing a system configuration of a SIP communication network that performs call control using SIP. This SIP communication network includes a terminal 5 used by a subscriber of the network, a call control server 1 that controls a call such as a call connection request transmitted from the terminal 5, and terminations inside and outside the transfer network according to instructions from the call control server 1 A media gateway (MG) 3 that links (Termination), a router RT, a switch SW, a home gateway HGW, and the like that physically connect the terminal 5, the call control server 1, and the media gateway 3 so that they can communicate with each other. And various network devices 7.

  When starting a voice call or video communication with a desired partner, a SIP signal required for call connection such as INVITE is transmitted from the terminal 5 to a partner terminal (not shown). Actually, the SIP signal from the terminal 5a is transmitted to the call control server 1, and the call control server 1 that has received the SIP signal receives another call control server 1a that is adjacently connected or the call control server 1b ahead of it. The call request is made to the partner terminal via the SIP.

  Then, SIP negotiation is performed between the two terminals (specifically, between the call control servers, between the call control server and the terminals, etc.) based on the contents of SDP (Session Description Protocol), and the negotiation result is If it is OK, a SIP session is established between both terminals. The SDP media information includes information such as a required bandwidth and a transfer quality class required for various media communications such as voice and moving images.

  Thereafter, session information for media communication such as voice communication and video communication is determined, and after the media session is established, voice communication and video communication are possible. In FIG. 15, a physical connection state between apparatuses or devices, a communication path through which SIP packets and media traffic actually flow are indicated by a solid line, and a logical flow of the SIP signal is indicated by a broken line.

  Here, the configuration of the call control server 1 will be described. The call control server 1 communicates between a call processing unit (CSCF: Call Session Control Function) 11 for processing a call such as a call connection request transmitted from the terminal 5 and between devices or devices constituting the SIP communication network. A resource management unit (RACS: Resource and Admission Control Subsystem) 12 that manages resources of a route (specifically, a link or path between nodes such as between a media gateway and a router or between a router and a switch) It consists of and.

  The resource management unit 12 is composed of various functional units. In particular, a resource management function unit (A-RACF: Resource and Admission Control Function), a policy setting function unit (SPDF: Service Policy Decision Function), The function unit configured as described above is called a media gateway controller (MGC) 121 because it controls the media gateway 3 based on a request from the call processing unit 11.

  As described above, the resource management unit 12 (actually, the media gateway controller 121, the same applies hereinafter) determines the use bandwidth, the upper limit bandwidth, and the like of the communication path classified according to the priority and the quality. It is stored and managed in advance in a memory or the like as a virtual path, and is determined at the time of the SIP negotiation when a new communication path establishment request is transmitted from the call processing unit 11 based on a new call connection request from the terminal 5 Secures a media bandwidth according to part or all of the media information of the SDP, and increments or decrements the current bandwidth, and accepts whether the requested media bandwidth exceeds the upper limit bandwidth of the virtual path Judgment (for example, packet loss due to interference between one or more media traffic established by SIP negotiation when passing through the transport network) Determining whether to perform the acceptance determination).

  In addition, when the call is started with respect to one or more corresponding virtual paths after specifying the route between the terminals from all the virtual paths managed by the resource management unit 12, the bandwidth is added or lowered. This means adding the requested bandwidth and subtracting the added bandwidth at the end of the call.

  If the media session establishment based on the new call connection establishment request is usable within the virtual path upper limit band as a result of the acceptance determination, a termination for connecting the terminals to each other is generated in the media gateway 3 and the SIP For each negotiation result, session information including media information as shown in FIG. 15 (each media information includes a media type, a requested bandwidth, a direction attribute, etc.) is stored.

  After that, the resource management unit 12 performs pinhole control and policing control for the media gateway 3 (dashed line shown in FIG. 15). The pinhole control here refers to setting of media ports used for media transfer such as voice communication and video communication between the terminals and between the terminal and the call control server 1 with respect to the media gateway 3. It means the control that actually performs.

  On the other hand, before performing the pinhole control and the policing control, the resource management unit 12 performs pinhole control and policing control with contents different from the above in order to pass the SIP signal used for SIP negotiation. The pinhole control is a process of setting a SIP port used for SIP signal control in the media gateway 3 and is performed when the subscriber contract information is input to the call control server 1. The SIP port to be set is determined based on the subscriber contract information already registered in the call control server 1, REGISTER information transmitted from the terminal 5, and DHCP information issued to the terminal 5. It is generated upon registration and is managed as SIP port information. It is deleted when the subscriber contract information is deleted.

  The megaco protocol is used for pinhole control and policing control (megaco control). Further, when receiving a bandwidth reservation request, reservation request, and change request, each request, the media information in the request, and the reception time are recorded. On the other hand, when a bandwidth deletion request is received, the received request information and each media information are deleted from the memory or the like.

  Further, in policing control, the calling user type, the called user type, the priority in the SDP information and the priority of the subscriber information are identified, and when the congestion occurs in the SIP communication network, the call priority is identified and the packet Communication is regulated.

  As described above, the resource management unit 12 controls packets flowing in and out of the transfer network of the SIP communication network. Such a technique is disclosed in Patent Document 1.

  On the other hand, the media gateway 3 sets a SIP port in accordance with an instruction from the resource management unit 12, generates a termination that connects the inside and outside of the transfer network so that communication is possible, and based on pinhole control and policing control settings, Set the media port required for communication. The media gateway 3 is generally composed of functional units called C-BGF (Core Border Gateway Function), I-BGF (Interconnection Border Gateway Function), and RCEF (Resource Control Enforcement Function).

  As described above, the resource management unit 12 and the media gateway 3 each store and manage session information including at least SIP port information and media port information. Then, the call control server 1 can perform matching processing in which the two pieces of session information are compared and matched in preparation for a case where one of the devices fails.

  The call control server 1 is connected between the call control server 1 and the media gateway 3, between the call processing unit 11 and the resource management unit 12 constituting the call control server 1, or between the call control server 1 and the terminal. In addition to session information, information related to pinhole control and policing control, subscriber contract information, REGISTER information, and DHCP information can be respectively matched with each other.

JP 2003-258855 A

  Conventionally, it has been difficult to collect and accurately manage physical IF (interface) information of a media gateway, and therefore, pinhole control and policing control have been performed in units of media gateways and subscribers.

  However, since the media gateway does not hold the subscriber contract information, when the matching process is performed in units of media gateways, the media gateway side processes even the subscribers that do not need to be updated. It took a long time. In addition, when the matching process is performed in units of subscribers, the number of processes in the resource management unit increases, or duplication processes are required in physical units managed by the media gateway, which is inefficient.

  In addition, when a media gateway malfunctions or when memory is not relieved by the resource manager, all communications are disconnected and disconnection is possible. However, it is desirable to increase the number of new communication opportunities by setting the media gateway as blank. On the other hand, at the time of resuming the memory for which periodic processing or communication is relieved, there is an unnecessarily inconsistent or wasteful memory due to an event during communication interruption. The purpose is to release the reservation, and it is necessary to perform the matching process to make it consistent without affecting the normal process even if time is required. In particular, since subscriber contract information is not information that is changed due to communication interruption or media gateway failure, if information is maintained in the resource management unit, it must be handled separately from media port information. Since the matching processing route increases and becomes complicated, it has not been realized.

  Also, when events such as media gateway failures compete, it is necessary to determine a combination of events according to a certain policy.

  Also, when updating the subscriber contract information, even if the media gateway is in a failure state, the uniform processing is performed on the media gateway, and after waiting until the timeout is reached, the update is processed as failed. It took time to register the subscriber contract information in a timely manner.

  In addition, because there were few comparison targets such as information related to pinhole control and policing control that allow the SIP signal to pass through, and subscriber contract information and REGISTER information of the call control server for generating them in the media gateway, the two parties Inconsistency cannot be detected, and useless resources have been secured.

  As described above, two pieces of information having different usage purposes such as SIP port information that is retained as long as subscriber contract information exists and media port information that is generated and deleted for each call have been subjected to matching processing as one session information. In some cases, there is a problem that unnecessary matching processing is included and matching processing takes time.

  Also, even if these events are different, such as periodic matching and MG failure recovery that triggers the matching processing, the matching processing is performed uniformly, so the processing until failure recovery for each event is inefficient. There was a problem.

  Also, even if an event such as MG failure recovery occurred during the alignment process triggered by a regular alignment event and the alignment processes competed, the respective alignment processes were executed in sequence, so that There was a problem in that the processing until equality was inefficient.

  In addition, since the SIP port is set in the media gateway when the subscriber contract information is input to the call control server, the subscriber contract information cannot be registered in the call control server when a malfunction such as a failure occurs in the media gateway. There was a problem.

  The present invention has been made in view of the above, and an object of the present invention is to reduce the time required for session information matching processing.

  The session information matching processing method according to claim 1, wherein a call is processed by a call control server that controls a media gateway capable of processing a call using SIP and transferring media determined as a result of SIP negotiation. Session information that is managed by the processing means and includes SIP control port information used for SIP control by the media gateway and media transfer port information used for media transfer by the media gateway is set as first information. The first step stored in the storage means, and the resource management means for managing the resources of the transfer network to which the media is transferred, are composed of the SIP control port information and the media transfer port information. A second step of storing session information in the second storage means. And the session information read from the first storage means and the session information read from the second storage means are compared, and a matching process is performed to match one session information with the other session information. The session information managed by the media gateway and configured by the SIP control port information and the media transfer port information, and the session information managed by the resource management means And a fourth step for performing the matching process, wherein the third step and the fourth step perform the matching process by distinguishing the SIP control port information from the media transfer port information. It is characterized by that.

  According to the present invention, since the matching process is performed by distinguishing the SIP control port information and the media transfer port information, it is possible to execute only the necessary matching process, thereby reducing the time required for the session information matching process. can do.

  The session information matching processing method according to claim 2 is the session information matching processing method according to claim 1, wherein the contents of matching processing of the SIP control port information and the media transfer port information are set as event types. The third step performs the matching process with the contents of the matching process according to the event that has occurred, and the fourth step depends on the event that has occurred. The matching process is performed for each media gateway with the contents of the matching process.

  According to the present invention, the matching processing contents of the SIP control port information and the media transfer port information are stored differently depending on the type of event, and matching is performed with the matching processing contents according to the event that has occurred. Since the process is performed, it is possible to limit the matching range according to the event, and the time required for the session information matching process can be further shortened.

  The session information matching processing method according to claim 3 is the session information matching processing method according to claim 2, wherein the third step and the fourth step are performed during the matching processing based on a predetermined event. If the matching process based on this event occurs and multiple matching processes compete, and if the subsequent event is a failure occurrence or failure recovery type event, the matching process of the preceding event is stopped and the subsequent event is based A matching process is performed, and when the preceding event is a failure occurrence or failure recovery type event, the matching process based on the subsequent event is not performed.

  According to the present invention, when the subsequent event is a failure occurrence or failure recovery type event, the matching process of the previous event is stopped and the matching process based on the subsequent event is performed. If this is an event, the matching process based on the subsequent event is not performed, so it is possible to execute only the necessary matching process by judging the combination of conflicts, and further reduce the time required for the matching process of session information. Can do.

  The session information matching processing method according to claim 4 is the session information matching processing method according to any one of claims 1 to 3, wherein when the media gateway is inoperable, an addition request and update of subscriber contract information is performed. When there is either a request or a deletion request, the resource management means stores a certain temporary state without setting the SIP control port in the media gateway, and A response indicating that the request is possible is transmitted to the call processing means.

  According to the present invention, when there is a request for adding, updating, or deleting subscriber contract information when the media gateway is inoperable, the resource management means sends the SIP control port to the media gateway. When a failure such as a failure occurs in the media gateway because a certain temporary state is stored without setting the password, and a response that can request addition / update / deletion of subscriber contract information is sent to the call processing means. Even so, the subscriber contract information can be registered in the call control server.

  The call control server according to claim 5, wherein the call control server processes a call using SIP, and controls a media gateway capable of transferring a media determined as a result of SIP negotiation. And stores session information including SIP control port information used for SIP control at the media gateway and media transfer port information used for media transfer at the media gateway. A second storage unit configured to store session information that is managed by a storage unit and a resource management unit that manages resources of a transfer network to which the medium is transferred, and includes the SIP control port information and the media transfer port information; Storage means and a session read out from the first storage means Managed by the media gateway, and a first matching unit that performs matching processing for matching one session information with the other session information by comparing the session information read from the second storage unit The second matching is performed by comparing the session information configured by the SIP control port information and the media transfer port information with the session information managed by the resource management unit. And the first matching unit and the second matching unit perform the matching process by distinguishing between the SIP control port information and the media transfer port information.

  According to the present invention, since the matching process is performed by distinguishing the SIP control port information and the media transfer port information, only the necessary matching process can be executed, and the time required for the session information matching process can be shortened. be able to.

  The call control server according to claim 6 is the call control server according to claim 5, wherein the matching processing contents of the SIP control port information and the media transfer port information differ depending on the type of event. The first matching unit performs the matching process with the contents of the matching process according to the event that has occurred, and the second matching unit determines whether the event has occurred. The matching processing is performed for each media gateway with the matching processing content corresponding thereto.

  According to the present invention, the matching processing contents of the SIP control port information and the media transfer port information are stored differently depending on the type of event, and matching is performed with the matching processing contents according to the event that has occurred. Since the process is performed, it is possible to limit the matching range according to the event, and the time required for the session information matching process can be further shortened.

  The call control server according to claim 7 is the call control server according to claim 6, wherein the first matching unit and the second matching unit perform other events during the matching process based on a predetermined event. If the matching process based on the event occurs and multiple matching processes compete, and the subsequent event is a failure occurrence or a failure recovery system event, the matching process based on the subsequent event is stopped after stopping the matching process of the preceding event If the preceding event is a failure occurrence or failure recovery type event, the matching process based on the subsequent event is not performed.

  According to the present invention, when the subsequent event is a failure occurrence or failure recovery type event, the matching process of the previous event is stopped and the matching process based on the subsequent event is performed. If this is an event, the matching process based on the subsequent event is not performed, so it is possible to execute only the necessary matching process by judging the combination of conflicts, and further reduce the time required for the matching process of session information. Can do.

  The call control server according to claim 8 is the call control server according to any one of claims 5 to 7, wherein when the media gateway is inoperable, an addition request, an update request, and a deletion request for subscriber contract information. The resource management means stores a certain temporary state without setting the SIP control port in the media gateway and can make the request for the subscriber contract information. Is transmitted to the call processing means.

  According to the present invention, when there is a request for adding, updating, or deleting subscriber contract information when the media gateway is inoperable, the resource management means sends the SIP control port to the media gateway. When a failure such as a failure occurs in the media gateway because a certain temporary state is stored without setting the password, and a response that can request addition / update / deletion of subscriber contract information is sent to the call processing means. Even so, the subscriber contract information can be registered in the call control server.

  According to the present invention, the time required for session information matching processing can be reduced.

It is a figure which shows the functional block structure of a call control server. It is a figure which shows a part of content of SIP port information, media port information, subscriber contract information, REGISTER information, and DHCP information. It is a figure explaining a matching process. It is a figure which shows an example of the content of matching processing. It is a figure which shows the matching process flow at the time of the regular matching event between a call processing part and a resource management part in case the opportunity of a matching process is a call processing part and a matching process target is SIP port information. It is a figure which shows the matching process flow at the time of the regular matching event between a call processing part and a resource management part in case the opportunity of a matching process is a call processing part, and a matching process target is media port information. It is a figure which shows the matching processing flow between a call processing part and a resource management part in case the opportunity of a matching process is a resource management part. It is a figure which shows the matching processing flow at the time of the regular matching event between a resource management part and a media gateway. It is a figure which shows the matching process sequence in case all of a call processing part, a resource management part, and a media gateway have SIP port information. It is a figure which shows the matching process sequence in case only a resource management part and a media gateway have SIP port information. It is a figure which shows the matching process sequence in case only a call process part has SIP port information. It is a figure which shows the matching process sequence in case all of a call processing part, a resource management part, and a media gateway do not have SIP port information. It is a figure which shows an example of the matching process given priority in the matching process competition. It is a figure which shows the process sequence when subscriber contract information is thrown in. It is a figure which shows roughly the system configuration | structure of the SIP communication network which performs call control using SIP.

  Hereinafter, an embodiment for carrying out the present invention will be described with reference to the drawings. However, the present invention can be implemented in many different modes and should not be construed as being limited to the description of the present embodiment.

[Configuration and function of call control server]
FIG. 1 is a diagram showing a functional block configuration of a call control server according to the present embodiment. As described in the background art with reference to FIG. 15, the call control server 1 processes a call using SIP, and controls the media gateway 3 that can transfer media determined as a result of SIP negotiation. Thus, the call processing unit 11, the resource management unit 12, the address management unit 13, the first session information matching unit 104, the second session information matching unit 105, and different matching processing contents depending on the type of event that occurs Is stored in the matching process content storage unit 106. Hereinafter, each of these functional units will be described.

  The call processing unit 11 has a function of processing a call such as a call connection request transmitted from a terminal (not shown), and SIP port information (SIP control port information) used for SIP control in the media gateway 3 and Session processing information including media port information (port information for media transfer) used for media transfer in the media gateway 3, and REGISTER information and subscriber contract (SO) information transmitted from the terminal are stored for the call processing unit. The unit 101 stores and manages it.

  The resource management unit 12 has a function of managing resources of communication paths such as between devices constituting the SIP communication network, and includes session information composed of the SIP port information and the media port information, and a terminal The transmitted subscriber contract information is stored and managed in the resource management unit storage unit 102.

  The address management unit 13 has a function of managing the address of the contractor's terminal and the like. The address management unit stores the DHCP information issued when a call connection is made from the terminal and the subscriber information transmitted from the terminal. The storage unit 103 manages the storage.

  Part of the contents of the SIP port information, media port information, subscriber contract information, register information, and DHCP information stored and managed in the call control server 1 are shown in FIG. SIP port information and media port information have a common data format, and when SIP is described in the media type, the data becomes SIP port information.

  The first session information matching unit 104 compares the session information stored and managed by the call processing unit 11 with the session information stored and managed by the resource management unit 12, and determines one session information as the other session information. When performing the matching process to match, the SIP port information and the media port information are distinguished from each other and the matching process is performed. Specifically, if the session information is different, the SIP port information or the media port information is matched by releasing resources by deleting the termination. However, when the matching processing target is SIP port information, after the resource is released, the termination is reset when the subscriber of the corresponding termination still exists in the subscriber contract information of the call processing unit 11. Do.

  Further, the first session information matching unit 104 has a function of determining whether or not there is an IP address map and regenerating the IP address map when subscriber data exists in the subscriber contract information of the call processing unit 11. ing. The IP address map is used in the call processing unit 11 for terminal authentication and address conversion in the SIP signal. When the map information is deleted, the terminal address is matched with the address management unit 13, and the media gateway is used. The payout address to 3 is consistent with the resource management unit 12.

  Further, the first session information matching unit 104 has a function of collating SIP port information notified to the call processing unit 11 by AAA (Authentication, Authorization, Accounting) at REGISTER opportunity. It is also possible to collate with the SIP port information of the resource management unit 12 at REGISTER opportunity.

  Further, the first session information matching unit 104 has a function of determining whether or not there is subscriber contract information in the call processing unit 11 and resetting the termination of the SIP port information. Even when the call processing unit 11 and the resource management unit 12 do not have session information, if the subscriber contract information exists, the SIP port is reset.

  The second session information matching unit 105 is stored and managed by the media gateway storage unit 301 of the media gateway 3, and session information composed of the SIP port information and the media port information is stored and managed by the resource management unit 12. In contrast to the first session information matching unit 104, the SIP port information and the media port information are separated when performing matching processing for matching one session information with the other session information. Separately, it has a function of performing matching processing.

  Further, the second session information matching unit 105 has a function of determining the content of termination, and determining that there is no termination when the terminal-side termination AC and the network-side termination BB are not in pairs. Yes.

  In addition, the second session information matching unit 105 has a function of determining the termination state and updating the termination state of the media gateway 3 so as to match the termination state of the resource management unit 12. In order to determine whether or not a media communication request from the terminal is possible, the termination status is managed as INS (InService: acceptable), OUT (OutOfService: not acceptable) (corresponding to the service status shown in FIG. 2).

  The second session information matching unit 105 has a function of determining and matching the call state (all call state targets) of soft resources. A request for termination setting is made from the resource management unit 12 to the media gateway 3, and the response waiting state (pending state) from the media gateway 3 is also subject to matching.

  Further, the second session information matching unit 105 has a function of determining the presence or absence of subscriber contract information of the resource management unit 12 and setting a SIP port in the media gateway 3. The subscriber contract information of the resource management unit 12 is subscriber accommodation information. The media gateway 3 is specified from this information, the provision conditions are determined, and the SIP port is set in the media gateway 3.

  In the functional block configuration diagram shown in FIG. 1, the first session information matching unit 104 and the second session information matching unit 105 are described outside other functional units, but this conceptually explains the invention. It is described as such. For example, when the session information stored and managed by the call processing unit 11 matches the session information stored and managed by the resource management unit 12, the first session information matching unit 104 is one of the call processing units 11. It operates as a function (that is, call processing unit 11). On the other hand, when the session information stored and managed by the resource management unit 12 matches the session information stored and managed by the call processing unit 11, the first session information matching unit 104 It operates as one function (that is, the resource management unit 12). The second session information matching unit 105 operates as a function of the resource management unit 12 (that is, the resource management unit 12).

[About the matching process of the call control server]
Next, the matching process of the call control server 1 will be specifically described. FIG. 3 is a diagram for explaining the matching process.

  First, SIP port information matching processing will be described. The first session information matching unit 104 compares the REGISTER information transmitted from the terminal 5 in the call processing unit 11 with the SIP port information of the resource management unit 12, and the DHCP information stored and managed by the address management unit 13 The SIP port information of the call processing unit 11 based on the above and the SIP port information of the resource management unit 12 are compared and matched. For example, using a regular matching event once a day as a trigger, matching is executed by comparing the subscriber contract information, termination status, and the like using the session ID as a key. Thereby, the SIP port information between the call processing unit 11 and the resource management unit 12 is matched.

  The second session information matching unit 105 compares and matches the SIP port information of the resource management unit 12 with the SIP port information of the media gateway 3 (SIP termination information). For example, the MGC restart, the MG restart, and the regular matching event once a day trigger the matching by comparing the termination ID, termination state, and the like managed for each SIP port. Thereby, the SIP port information between the resource management unit 12 and the media gateway 3 is matched.

  Since the SIP port is operation data that is retained as long as the subscriber contract information exists, the above-mentioned matching processing of the SIP port information is performed by the call control server 1 from the media after releasing the corresponding termination when mismatching is detected. Matching is realized by the process of resetting the SIP port to the gateway 3.

  Next, media port information matching processing will be described. In addition to the above SIP port information matching process, the first session information matching unit 104 generates media port information of the call processing unit 11 that is generated based on the SIP negotiation result and is used for communication of media information, and the call from the call processing unit 11. For each request, the media port information of the resource management unit 12 managed in association with the SIP port information is compared and matched. For example, in response to an event such as a SIP signal update or a refresh timer, matching is executed by comparing the termination ID and the like managed in association with the session using the session ID of the media port as a key. As a result, the media port information between the call processing unit 11 and the resource management unit 12 is matched.

  In addition to the SIP port information matching process, the second session information matching unit 105 manages the media port of the resource management unit 12 that is managed in association with the SIP port information for each call request from the call processing unit 11. The information and the media port information (media termination information) of the media gateway 3 are compared and matched. For example, the MGC restart, the MG restart, and the regular matching event once a day trigger the matching by comparing the termination ID, termination state, etc. managed for each SIP port. Thereby, the media port information between the resource management unit 12 and the media gateway 3 is matched.

  Note that since the media port is information generated for each call, the matching processing of the media port information is realized by releasing the corresponding termination when mismatch is detected.

  The first session information matching unit 104 can also match only the SIP port information or the media port information at a certain timing in the same way for the second session information matching unit 105. It is also possible to perform matching processing.

[Contents of matching processing of call control server]
Next, the contents of the matching process of SIP port information and media port information will be described. As shown in FIG. 4, the matching processing content storage unit 106 shown in FIG. 1 stores the matching processing contents executed by the SIP port information and the media port information respectively as periodic matching, MG failure recovery (MG restart, Megaco Disconnection recovery), MG IF failure recovery, call control server failure recovery (resumption), and the like.

  Since the SIP port is operational data that is generated by the call control server 1 along with the registration of subscriber contract information and is relieved until the subscriber contract information is abolished as described above, the SIP port is stored in the matching processing content storage unit 106. The matching processing contents of the set SIP port information are made consistent by releasing the corresponding termination once when inconsistency is detected, and executing recovery by resetting the SIP port from the call control server 1 to the media gateway 3 It is set on the basis of realizing.

  Further, since the media port is call data generated for each call as described above, the matching processing content of the media port information set in the matching processing content storage unit 106 is a non-relief resource when a mismatch is detected. Is set based on the realization of matching by releasing the corresponding termination.

  The first session information matching unit 104 and the second session information matching unit 105 identify which event is the matching trigger, acquire the matching process content corresponding to the generated event from the matching process content storage unit 106, and Information or session information matching processing is executed. In particular, the second session information matching unit 105 executes the matching process for each media gateway, not for all the media gateways 3 managed by the call control server 1.

  For example, the state of the physical IF unit or the MG unit of the media gateway 3 is stored and managed, and when restarting the MG, after changing the management state of the MG unit to INS, the MG state is not verified, and the SIP unit is changed to the SIP unit. Delete in the order of port information-> media port information. Further, at the time of regular matching or MGC restart, collation is performed for each SIP and media type in units of physical IF of the media gateway 3. Furthermore, when the physical IF of the media gateway 3 fails, after assigning the physical IF state of the managed media gateway 3, the management state is changed to INS, and only the relevant physical IF is targeted for each SIP and media type. To match. If a mismatch is detected between the resource management unit 12 and the media gateway 3 as a result of the matching, matching matching is executed.

[Regarding the consistency processing flow of the call control server]
Next, the matching process flow of the call control server 1 will be described by taking an example of a regular matching event as an example. First, a matching process flow between the call processing unit 11 and the resource management unit 12 will be described.

  FIG. 5 is a diagram showing a matching process flow at a regular matching event between the call processing unit and the resource management unit when the matching process is triggered by the call processing unit and the matching processing target is SIP port information. It is.

  First, a matching target list is generated from the SIP port information of the call processing unit 11 (S1), and one piece of subscriber contract information of the call processing unit 11 is acquired (S2).

  Next, when the subscriber contract information acquired in S2 is included in the matching target list, the timer of the SIP port information of the resource management unit 12 is updated (S3).

  Next, when the timer update fails in S3, the SIP port information of the resource management unit 12 is deleted (S4), and after the DHCP information is acquired (S5), the SIP port information of the resource management unit 12 is regenerated. (S6). If the timer update is successful in S3, the process is terminated without executing anything.

  On the other hand, when the subscriber contract information acquired in S2 is not included in the matching target list, the process proceeds to S5, and after the DHCP information is acquired, the SIP port information of the resource management unit 12 is regenerated (S6). ).

  FIG. 6 is a diagram showing a matching process flow at a regular matching event between the call processing unit and the resource management unit when the matching process is triggered by the call processing unit and the matching processing target is media port information. It is.

  First, the media port information of the call processing unit 11 is referred to and the timer is confirmed (S11). Note that the timer of the media port information is updated by a timer update request from the terminal or HGW.

  Next, when the timer has expired, the media port information between the call processing unit 11 and the resource management unit 12 is deleted (S12). On the other hand, if the timer has not expired in S11, the process ends without executing anything.

  FIG. 7 is a diagram illustrating a matching process flow between the call processing unit and the resource management unit when the trigger of the matching process is the resource management unit. This matching process flow is common to both SIP port information and media port information.

  First, the timer of the session information (SIP port information or media port information) held by the resource management unit 12 is confirmed (S21).

  Next, when the timer has expired in S21, the presence or absence of session information (SIP port information or media port information) of the call processing unit 11 is confirmed (S22). On the other hand, if the timer has not expired in S21, the process ends without executing anything.

  Next, when the call processing unit 11 has session information (SIP port information or media port information) in S22, the timer of the session information (SIP port information or media port information) of the resource management unit is updated (S23). If there is no session information (SIP port information or media port information) in the call processing unit 11 in S22, the session information (SIP port information or media port information) is deleted when the timer expires (S24).

  Next, a matching process flow between the resource management unit 12 and the media gateway 3 will be described.

  FIG. 8 is a diagram showing a matching process flow at a regular matching event between the resource management unit and the media gateway. This matching process flow is common to both SIP port information and media port information.

  First, the matching target list 1 is generated from the session information (SIP port information or media port information) of the resource management unit 12 (S31), and is matched from the response result to the information collection request transmitted from the resource management unit 12 to the media gateway 3 A target list 2 is generated (S32), and the two lists are compared (S33).

  As a result of the comparison in S33, when it exists only in the matching target list 1, the session information (SIP port information or media port information) of the resource management unit 12 is deleted (S34), and the subscriber contract information is obtained by the call processing unit 11. If there is subscriber contract information, session information (SIP port information or media port information) is set by the call processing unit 11 (S36).

  On the other hand, if the result of the comparison in S33 is only in the matching target list 2, a deletion request is transmitted to the media gateway 3 and the session information (SIP port information or media port information) of the media gateway is deleted ( S37).

  On the other hand, if the result of the comparison in S33 is in both the matching target list 1 and the matching target list 2, the process is terminated without executing anything.

[About the matching processing sequence of the call control server]
Next, a matching processing sequence of SIP port information from the call processing unit 11 will be described with a regular matching event as a trigger.

  FIG. 9 is a diagram showing a matching processing sequence in a case where all of the call processing unit, the resource management unit, and the media gateway have SIP port information.

  First, the call processing unit 11 confirms its own SIP port information at a regular matching opportunity, and transmits a status inquiry signal for updating the timer of the SIP port information to the resource management unit 12 ( S101).

  Next, the resource management unit 12 confirms its own SIP port information, and if the same SIP port information as the SIP port information held by the call processing unit 11 exists, the timer of the corresponding SIP port information is updated. Then, the response result of the update success is transmitted to the call processing unit 11 (S102).

  The matching processing sequence described above corresponds to S1 to S3 shown in FIG.

  FIG. 10 is a diagram illustrating a matching process sequence in the case where only the resource management unit and the media gateway have SIP port information.

  First, the call processing unit 11 confirms its own SIP port information held at a regular matching opportunity, and if there is no SIP information despite the presence of subscriber contract information, the address of the terminal is Obtained from the address management unit 13 (S201).

  Next, the call processing unit 11 transmits a SIP port reset request including the acquired address to the resource management unit 12 (S202).

  Next, the resource management unit 12 once deletes its own SIP port information and the SIP port information of the media gateway 3 (S203).

  Next, the resource management unit 12 transmits an information collection request to the media gateway 3, and SIP port information is reset based on the response result (S204).

  In the matching processing sequence described above, S201 to S202 correspond to S4 to S5 shown in FIG. 5, and S204 corresponds to S31 to S37 shown in FIG.

  FIG. 11 is a diagram showing a matching process sequence when only the call processing unit has SIP port information.

  First, the call processing unit 11 confirms its own SIP information at a regular matching opportunity, and transmits a status inquiry signal for updating the timer of the SIP port information to the resource management unit 12 (S301). ).

  Next, the resource management unit 12 confirms its own SIP port information, and if the same SIP port information as the SIP port information held by the call processing unit 11 does not exist, the response result of the update failure is the call processing unit. 11 (S302).

  Next, when the response result from the resource management unit 12 is an update failure, the call processing unit 11 transmits a SIP port reset request to the resource management unit 12 after a deletion request (not shown) (S302). . The deletion request is executed to update the SIP port information held by the call processing unit 11 or to delete unnecessary SIP port information of the resource management unit 12 without fail. It is also possible not to perform.

  Next, the resource management unit 12 transmits an information collection request to the media gateway 3, and the SIP port information is reset based on the response result (S304).

  FIG. 12 is a diagram showing a matching processing sequence when all of the call processing unit, the resource management unit, and the media gateway do not have SIP port information.

  First, the call processing unit 11 confirms its own SIP information held at a regular matching opportunity, and if there is no SIP information despite the presence of subscriber contract information, the address of the terminal is the address. Obtained from the management unit 13 (S401).

  Next, the call processing unit 11 transmits a SIP port reset request including the acquired address to the resource management unit 12 (S402).

  Next, the resource management unit 12 transmits an information collection request to the media gateway 3, and the SIP port information is reset based on the response result (S403).

  As described above, according to the present embodiment, SIP port information and media port information are distinguished from each other and matching processing is performed, so that only necessary matching processing can be performed, and time required for session information matching processing And unnecessary resources can be avoided.

  As described above, according to the present embodiment, the matching process contents of the SIP port information and the media port information are stored differently depending on the type of event, and the matching process contents according to the event that has occurred are stored. Since the matching process is performed, the range of matching can be limited according to the event, the time required for the matching process of the session information can be further shortened, and the load on the call processing at the normal time can be reduced. it can.

[Processing at event conflict]
Next, a description will be given of a case where matching processing based on another event occurs during matching processing based on a predetermined event. In this way, when multiple matching processes compete, the previous matching process by the starting event is stopped (can be interrupted or canceled), and the subsequent matching process by the subsequent event is started. The priority process is prioritized, and any of the first priority processes that do not execute the subsequent matching process is performed.

  As a criterion for priority processing, when the subsequent event is a failure occurrence or failure recovery type event, the matching processing based on the subsequent event is performed by stopping the matching processing of the preceding event. On the other hand, when the preceding event is a failure occurrence or failure recovery type event, only the matching process of the preceding event is executed, and the subsequent event is regarded as an error without performing the matching process or is performed in the next cycle.

  FIG. 13 is a diagram illustrating an example of a matching process that is prioritized when a matching process conflicts. In the pattern of (1) shown in FIG. 13, for example, each of the media gateways 3 stored in the resource management unit 12 in order (in ascending order of the numbers assigned to the media gateways 3) in a periodic matching start event. When a subsequent event (MG-MGC communication disconnection) that causes communication interruption of the media gateway 3 being matched occurs while the matching processing is being executed between the media gateway 3 and the resource management unit 12 Then, the matching process for the preceding event being executed is stopped and the matching process for the subsequent event is executed.

  In the pattern of (2), for example, when MG restart of the same media gateway occurs in the subsequent event during the matching process with the corresponding media gateway 3 in the preceding event (MG-MGC communication disconnection recovery). Then, the matching process for the preceding event being executed is stopped and the matching process for the subsequent event is executed.

  In the pattern of (3), for example, when a subsequent event (command matching to the same media gateway) occurs during the matching process with the media gateway at the MG restart preceding event, the matching process of the starting event The error response or skipping the subsequent event matching process is continued.

  Note that the matching process with the media gateway 3 is exclusively controlled in units of MG, and a matching state occurs when the matching process of the same media gateway occurs during the matching process of a certain media gateway 3, but the matching of other media gateways Processing is not treated as a conflict.

  As described above, according to this embodiment, when the subsequent event is a failure occurrence or failure recovery type event, the matching process based on the subsequent event is performed by stopping the matching process of the starting event, and the starting event is a failure. In the case of an occurrence or failure recovery type event, the matching process based on the subsequent event is not performed, so it is possible to execute only the necessary matching process by judging the combination of conflicts, and the time required for the matching process of the session information Can be further shortened.

[Processing when updating subscriber contract information]
Next, the processing operation when there is a request for adding, updating, or deleting subscriber contract information when the media gateway or the interface of the media gateway cannot operate due to a failure or the like will be described.

  FIG. 14 is a diagram showing a processing sequence when subscriber contract information is input. It is assumed that the resource management unit 12 stores and manages the operation state transition of the media gateway 3 in advance.

  First, when the subscriber contract information is newly input, the setting of the subscriber contract information is started by the call processing unit 11, the resource management unit 12, and the address management unit 13 that constitute the call control server 1. (S501).

  Next, since the SIP information for the newly entered subscriber contract information has not yet been generated by the call processing unit 11, the address of the terminal related to the subscriber contract information is acquired from the address management unit 13 (S502). .

  Next, the call processing unit 11 transmits a request for setting an SIP port used for controlling the SIP signal from the terminal to the resource management unit 12 (S503).

  Next, when the media gateway or the interface of the media gateway is out of order, the resource management unit 12 does not perform SIP port setting (pinhole control or policing control for allowing the SIP signal to pass) to the media gateway 3, A certain temporary state corresponding to the SIP port setting completed is generated and stored using the internal information of the management unit 12, and a response result (in other words, SIP port setting end in response to the request from the call processing unit 11 in S503) Then, the subscriber contract information input is OK) is transmitted (S504). Thus, the call processing unit 11 can add new subscriber contract information.

  On the other hand, if the media gateway or the interface of the media gateway is not in failure, SIP port setting is executed for the media gateway 3 (S505).

  After that, the resource management unit 12 triggers an event such as MG restart, IF failure recovery, or MG-MGC communication disconnection recovery to the media gateway 3 to set the SIP port for the setting request of S503 (SIP signal is passed) Pinhole control and polishing control) are executed (S506).

  In addition, when subscriber contract information is deleted, the media gateway 3 is not controlled, and it is matched at the time of a regular matching event between the resource management unit 12 and the media gateway 3.

  As described above, according to the present embodiment, when there is a request for adding, updating, or deleting subscriber contract information when the media gateway 3 is inoperable, the resource management unit 12 Since a certain temporary state is stored in the media gateway 3 without setting a SIP port, and a response that can request for addition / update / deletion of subscriber contract information is transmitted to the call processing unit 11, Even when a failure such as a failure occurs, the subscriber contract information can be registered in the call control server 1.

  Finally, the call control server 1 described in the present embodiment is configured by a computer. That is, the call processing unit storage unit 101, the resource management unit storage unit 102, the address management unit storage unit 103, and the matching processing content storage unit 106 are realized by a storage unit such as a memory. In addition, the call processing unit 11, the resource management unit 12, the address management unit 13, the first session information matching unit 104, and the second session information matching unit 105 are realized by arithmetic means such as a CPU, and are programmed. Executed.

  Further, the call control server 1 described in the present embodiment is recorded as a program in a readable manner on a recording medium such as an optical storage device or a magnetic storage device, and this recording medium is incorporated in a computer or recorded on a recording medium. Each processing operation described above can function as the call control server 1 by downloading the program to a computer via an arbitrary communication line or installing it from a recording medium and operating the computer with the program. Of course.

DESCRIPTION OF SYMBOLS 1 ... Call control server 11 ... Call processing part (call processing means)
12 ... Resource management section (resource management means)
13: Address management unit 101: Call processing unit storage unit (first storage unit)
102: Resource management unit storage unit (second storage unit)
103: Address management unit storage unit 104: First session information matching unit (first matching unit)
105 ... 2nd session information matching part (2nd matching means)
106 ... Consistency processing content storage unit (storage means)
DESCRIPTION OF SYMBOLS 3 ... Media gateway 301 ... Memory | storage part for media gateways 5 ... Terminal 7 ... Network equipment S ... Step

Claims (8)

A call control server that controls a media gateway capable of processing a call using SIP and transferring media determined as a result of SIP negotiation,
SIP control port information managed by call processing means for processing the call and used for SIP control in the media gateway, and media transfer port information used for media transfer in the media gateway A first step of storing session information in a first storage means;
Managed by resource management means for managing resources of the transfer network to which the media is transferred, session information composed of the SIP control port information and the media transfer port information is stored in a second storage means. A second step;
A third step of performing matching processing for comparing one session information with the other session information by comparing the session information read from the first storage means with the session information read from the second storage means. When,
The matching process is performed by comparing session information managed by the media gateway and configured by the SIP control port information and the media transfer port information, and the session information managed by the resource management unit. A fourth step of performing
The third step and the fourth step are:
A session information matching processing method, wherein matching processing is performed by distinguishing between the SIP control port information and the media transfer port information. The matching process contents of the SIP control port information and the media transfer port information are stored in the storage means so as to differ depending on the type of event,
The third step includes
Perform the matching process with the matching process content according to the event that occurred,
The fourth step includes
The session information matching processing method according to claim 1, wherein the matching processing is performed for each media gateway with the contents of the matching processing according to the event that has occurred. The third step and the fourth step are:
When a matching process based on another event occurs during a matching process based on a predetermined event and a plurality of matching processes compete with each other, if the subsequent event is a failure occurrence or a fault recovery system event, the starting event The matching process based on the subsequent event is not performed if the matching process is stopped and the matching process based on the subsequent event is performed, and the preceding event is the event of the failure occurrence or the failure recovery system. 2. The session information matching processing method according to 2. When there is a request for adding, updating, or deleting a subscriber contract information when the media gateway is inoperable,
The resource management means includes
A fixed provisional state is stored in the media gateway without setting the SIP control port, and a response indicating that the request for the subscriber contract information is possible is transmitted to the call processing means. 4. The session information matching processing method according to any one of 1 to 3. In a call control server that controls a media gateway capable of processing a call using SIP and transferring media determined as a result of SIP negotiation,
SIP control port information managed by call processing means for processing the call and used for SIP control in the media gateway, and media transfer port information used for media transfer in the media gateway First storage means for storing session information;
Second storage means for managing session information composed of the SIP control port information and the media transfer port information, managed by resource management means for managing resources of a transfer network to which the media is transferred; ,
The first matching is performed by matching the session information read from the first storage unit with the session information read from the second storage unit and matching one session information with the other session information. Means,
The matching process is performed by comparing session information managed by the media gateway and configured by the SIP control port information and the media transfer port information, and the session information managed by the resource management unit. Second alignment means for performing
The first alignment means and the second alignment means are:
A call control server that performs matching processing by distinguishing between the SIP control port information and the media transfer port information. Storage means for storing the matching processing contents of the SIP control port information and the media transfer port information differently according to the type of event;
The first alignment means includes
Perform the matching process with the matching process content according to the event that occurred,
The second alignment means includes
The call control server according to claim 5, wherein the matching process is performed for each media gateway with the contents of the matching process according to the event that has occurred. The first alignment means and the second alignment means are:
When a matching process based on another event occurs during a matching process based on a predetermined event and a plurality of matching processes compete with each other, if the subsequent event is a failure occurrence or a fault recovery system event, the starting event The matching process based on the subsequent event is not performed if the matching process is stopped and the matching process based on the subsequent event is performed, and the preceding event is the event of the failure occurrence or the failure recovery system. 6. The call control server according to 6. When there is a request for adding, updating, or deleting a subscriber contract information when the media gateway is inoperable,
The resource management means includes
A fixed provisional state is stored in the media gateway without setting the SIP control port, and a response indicating that the request for the subscriber contract information is possible is transmitted to the call processing means. The call control server according to any one of 5 to 7.

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